Selection of multiple officials and role sub-categories

apps/api/prisma/migrations/20261003150000_activity_assignees/migration.sql

@@ -0,0 +1,35 @@
+-- Multi-assignee support for activities (implicit many-to-many)
+CREATE TABLE IF NOT EXISTS "_ActivityAssignees" (
+    "A" TEXT NOT NULL,
+    "B" TEXT NOT NULL
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS "_ActivityAssignees_AB_unique" ON "_ActivityAssignees"("A", "B");
+CREATE INDEX IF NOT EXISTS "_ActivityAssignees_B_index" ON "_ActivityAssignees"("B");
+
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1 FROM pg_constraint WHERE conname = '_ActivityAssignees_A_fkey'
+  ) THEN
+    ALTER TABLE "_ActivityAssignees"
+      ADD CONSTRAINT "_ActivityAssignees_A_fkey"
+      FOREIGN KEY ("A") REFERENCES "Activity"("id")
+      ON DELETE CASCADE ON UPDATE CASCADE;
+  END IF;
+  IF NOT EXISTS (
+    SELECT 1 FROM pg_constraint WHERE conname = '_ActivityAssignees_B_fkey'
+  ) THEN
+    ALTER TABLE "_ActivityAssignees"
+      ADD CONSTRAINT "_ActivityAssignees_B_fkey"
+      FOREIGN KEY ("B") REFERENCES "User"("id")
+      ON DELETE CASCADE ON UPDATE CASCADE;
+  END IF;
+END $$;
+
+-- Backfill from legacy single assigneeId
+INSERT INTO "_ActivityAssignees" ("A", "B")
+SELECT a."id", a."assigneeId"
+FROM "Activity" a
+WHERE a."assigneeId" IS NOT NULL
+ON CONFLICT DO NOTHING;